Dishwasher in the form of a commercial utensil washer or dishwasher which is designed as a batch dishwasher

ABSTRACT

A dishwasher in the form of a commercial utensil washer or dishwasher which is designed as a batch dishwasher and is realized as a hood-type dishwasher, wherein the dishwasher has a treatment chamber with at least one wash system which is designed as a recirculation system, wherein the treatment chamber has a first treatment zone and at least one further, second treatment zone, wherein items of washware can be treated independently of one another and at least temporarily at the same time in the first and in the at least one second treatment zone.

CROSS-REFERENCES

This application is a Divisional of U.S. application Ser. No. 15/125,199filed Sep. 12, 2016, which is a National Stage filing of InternationalApplication No. PCT/US2015/019852 filed Mar. 11, 2015, which claimspriority of German Patent Application Nos. 10 2014 204 678.5 filed Mar.13, 2014; 10 2015 203 132.2 filed Feb. 20, 2015; 10 2015 203 133.0 filedFeb. 20, 2015; 10 2015 203 129.2 filed Feb. 20, 2015; and 10 2015 203127.6 filed Feb. 20, 2015, which are incorporated herein by reference intheir entireties.

TECHNICAL FIELD

The invention relates to a dishwasher in the form of a commercialutensil washer or dishwasher which is designed as a batch dishwasher.

BACKGROUND

Batch dishwashers are dishwashers which can be manually loaded andunloaded. Batch dishwashers (also called “box-type warewashers”) may behood-type dishwashers (“hood-type warewashers”) or front-loaderdishwashers (“front-loader warewashers”). Front-loader dishwashers maybe under-counter machines, top-counter machines or free-standingfront-loader dishwashers.

A dishwasher which is in the form of a batch dishwasher usually has onetreatment chamber for cleaning washware. The treatment chamber generallyhas arranged beneath it a wash tank in which liquid from the treatmentchamber can flow back due to the force of gravity. The wash tankcontains wash liquid which is usually water to which detergent may beadded if required.

A dishwasher which is designed as a batch dishwasher usually also has awash system comprising a wash pump, a line system which is connected tothe wash pump, and comprising a large number of spray nozzles which areformed in at least one wash arm. The wash liquid contained in the washtank can be conveyed from the wash pump to the wash nozzles via the linesystem and can be sprayed onto the washware to be cleaned through thewash nozzles in the treatment chamber. The sprayed wash liquid thenflows back into the wash tank.

A dishwasher of this kind which is designed as a batch dishwasher isknown, for example, from document DE 10 2005 023 429 A1.

The term “washware” used in the present document is intended to beunderstood to mean, in particular, crockery, glasses, cutlery, cookingutensils, baking utensils and serving trays.

The invention in particular relates to a dishwasher in the form of acommercial utensil washer or dishwasher which is designed as a batchdishwasher and is realized as a hood-type dishwasher, wherein thedishwasher has a treatment chamber with at least one wash system whichis designed as a recirculation system.

Dishwashers of this type are used primarily (but not exclusively) inrelatively small sculleries, for example in relatively small canteens,in particular school canteens, or in the catering sector. The use ofdishwashers of this kind is characterized by said dishwashers being usedin sculleries in which there is generally only a limited amount of floorspace available.

A commercial dishwasher, in particular a hood-type dishwasher, which isdesigned as a batch dishwasher differs from a domestic dishwasher inparticular in that a commercial dishwasher has to be designed in such away that—depending on the treatment program selected—program run timesof between one and five minutes can be realized, whereas domesticdishwashers generally have run times of up to 2.5 hours or more. Onaccount of the short program duration required in commercialdishwashers, techniques employed in domestic dishwashers generallycannot be readily transferred to commercial dishwashers.

Commercial dishwashers which are in the form of batch dishwashersnormally operate in two main process steps: a first step which includeswashing with a wash liquid, and a second step which includes finalrinsing with heated fresh water with the metered addition of a finalrinse aid.

In order to be able to carry out these process steps, a commercialdishwasher, which is designed as a batch dishwasher, is generallyequipped with two independent liquid systems. One liquid system is awash water circuit which is responsible for washing the washware, withwashing being carried out using recirculated water from the wash tank ofthe dishwasher. The other liquid system is a fresh water system which isresponsible for final rinsing. Final rinsing is carried out using freshwater, preferably using fresh water from a water heater (boiler). Thefresh water is likewise collected by the wash tank of the dishwasherafter being sprayed.

The main objective of final rinsing is to remove wash liquor from thewashware. In addition, the final rinse water which flows into the washtank during the final rinse step serves to regenerate the wash waterwhich is present in the wash tank.

Before fresh water is sprayed as final rinse liquid as a result of finalrinsing and thus conducted into the wash tank of the dishwasher, aquantity of wash liquid which is equal to the quantity of fresh water ispumped out of the wash tank.

Commercial dishwashers which are designed as batch dishwashers areusually equipped with several programs. These programs differ mainly dueto program run times of the wash process of different lengths. Theoperator has the option of selecting a short wash program for washwarewhich is lightly soiled, or of selecting a correspondingly longer washprogram for washware which is heavily soiled.

Commercial dishwashers, which are designed as batch dishwashers and aredesigned for loading washware into and unloading washware from thetreatment chamber in batches, are, in particular, front-loader machinesor hood-type machines. In the case of front-loader machines, thewashware is placed in a rack and the rack which is loaded with washwareis placed in the treatment chamber of the dishwasher through a frontdoor and, after cleaning, is removed again through the front door. Inthe case of hood-type machines, the dish racks which are loaded withwashware are pushed manually into the treatment chamber from an entryend and manually removed from the treatment chamber from an exit endwhen a wash program is complete. Front-loader machines and hood-typemachines contain only a single treatment chamber for treating thewashware. The front-loader machines may be under-counter machines ortop-counter machines.

Virtually without exception, commercial dishwashers which are designedas batch dishwashers and are designed for loading washware into andunloading washware from the treatment chamber in batches are realizedwith entry and/or exit tables. The dirty washware is usually manuallypre-cleared and manually pre-washed at the entry end of the dishwasher.Furthermore, the dirty washware is loaded into special dish racks here.The exit end is used for drying purposes and unloading the dish racks.

Particularly in the case of dishwashers which are realized as hood-typemachines, the wash level is usually at the same height as the entry andexit tables. In this way, the dish racks which are to be cleaned can beeasily and ergonomically pushed into the dishwasher from the entry tableand, after cleaning is complete, pushed out of the dishwasher onto theexit table.

The term “dishwashing level” used in the present document is intended tobe understood to mean the horizontal level at which the dish rack issituated. In the treatment chamber of a dishwasher, the dishwashinglevel is generally defined by a guide system, in particular guide rails,which accommodates a dish rack which is pushed into the treatmentchamber from an entry table which is provided at the inlet end of themachine.

Commercial batch dishwashers, in particular those which are realized ashood-type dishwashers, are designed to clean large quantities ofwashware in as short a time as possible. For example, instate-of-the-art hood-type dishwashers, the duration of a presetstandard program, which is usually used for washware, such as plates,trays, cups and glasses, with a normal level of soiling, lasts onlyapproximately 60 to 80 seconds. This provides a theoretical capacity ofup to 45 to 60 racks per hour.

However, depending on the washware and the degree of soiling of saidwashware, it may be necessary to select a treatment program with alonger duration in order to ensure a satisfactory cleaning result.

For example, in this connection, it is known from the prior art thatcommercial batch dishwashers have, for example, a special cutlerytreatment program (intensive treatment program) for improving thecleaning result specifically of cutlery. An intensive treatment programof this kind lasts considerably longer than said 60 to 80 seconds of thestandard treatment program, for example approximately 360 seconds.Therefore, it is clear that the capacity of the machine when theintensive treatment program is chosen is greatly reduced since thetreatment chamber is occupied for considerably longer than would be thecase with a standard treatment program.

In practice, this leads to special treatment programs which are usuallyalready provided as alternatives to the standard treatment program asstandard generally being chosen only rarely by the operator of thedishwasher, in spite of the improved washing performance, since thecorresponding program duration is found to be too long, in particular atpeak times, that is to say when there is an increased amount of washwarearriving. Instead, the heavily soiled washware (in particular cutleryand GN containers) is often likewise treated using the standardtreatment program and the poor washing performance is compensated for byadditional manual operating steps, such as manual pre-washing of heavilysoiled GN containers or separate pre-soaking of cutlery for example.

With heavily soiled washware, as is often the case with pots or pans forexample, it is necessary in particular to correspondingly increase thecycle length in order to be able to achieve an acceptable cleaningresult. In the case of hood-type dishwashers, the program run times areusually extended to up to 10 minutes in order to be able to cleanheavily soiled washware, in particular pots and pans with burnt-on foodresidues, in a hygienically satisfactory manner.

Consequently, the dishwasher cannot be used to clean lightly soiledwashware, such as plates, cups, cutlery or glasses for example, duringthese extended cycle times. In other words, the dishwasher is blockedfor a relatively long period of time in order to clean heavily soiledwashware, in particular pans and pots, this often leading to problems inrelatively small sculleries since accruing dirty dishes cannot becleaned or further processed during this period of time.

Therefore, in practice, particularly during peak times, the dishwasheris used only to clean lightly soiled washware, such as plates, cups andglasses for example, while the heavily soiled washware (in particularpots and pans) are manually cleaned in order to prevent the dishwasherbeing blocked for too long due to the relatively long cycle timesrequired.

SUMMARY

Accordingly, the present invention is based on the object of furtherdeveloping a commercial utensil washer or dishwasher, which is realizedas a hood-type dishwasher and is generally known in principle from theprior art, in such a way that no bottlenecks occur during cleaning ofthe accruing washware even during peak times in sculleries. Inparticular, the aim is to indicate a solution with which the operatingprocesses in sculleries can be simplified and optimized while at thesame time saving resources (energy, water and chemicals).

A further object is to develop a commercial utensil washer ordishwasher, which is realized as a hood-type dishwasher, to the effectthat the capacity of the machine can be increased, even when a treatmentprogram which leads to a longer cycle run time than would be the casewith a conventional standard treatment program is chosen. In particular,resources (energy, water and chemicals) should be saved at the same timein this case.

In order to achieve this object, the invention proposes, in particular,a dishwasher in the form of a commercial utensil washer or dishwasherwhich is designed as a batch dishwasher, wherein the dishwasher isrealized as a hood-type dishwasher, and wherein the dishwasher has atreatment chamber with at least one wash system which is designed as arecirculation system. According to the invention, the treatment chamberhas a first treatment zone and at least one further, second treatmentzone, wherein items of washware can be treated independently of oneanother and at least temporarily at the same time in the first and inthe at least one second treatment zone.

The term “can be treated independently of one another” used in thepresent document is intended to be understood to mean, in particular,the treatment zone-specific treatment of the washware in respect ofaction time, wash and/or rinse mechanics, and/or in respect of theselected treatment program. In other words, provision is made accordingto the invention to divide the treatment chamber into at least twozones, wherein at least some of the parameters which characterize thetreatment of the washware (such as the action time, the wash/rinsemechanics, the temperature and/or composition of the wash liquid/finalrinse liquid etc. for example) can be individually adjusted for eachtreatment zone.

In this connection, it is feasible for the two treatment zones to berealized physically, that is to say hermetically, separately from oneanother. This embodiment has the advantage, in particular, thatdifferent treatment programs can be selected for the correspondingtreatment zones of the treatment chamber. In this connection, it isfeasible, for example, for the washware to be treated in accordance witha standard treatment program in one treatment zone, while the washwareis treated in accordance with an intensive treatment program in anothertreatment zone which is physically separated from the first treatmentzone.

Secondly, the present invention is not restricted to batch dishwashersin which the at least two treatment zones of the treatment chamber arephysically (hermetically) separated from one another with the aid of apartition. Rather, according to a further aspect of the presentinvention, provision is made for the two treatment zones to be designedwithin a common treatment chamber, and in particular for no hermeticseparation to be provided between the at least two treatment zones.

Even in the case of embodiments of the kind in which the at least twotreatment zones are not hermetically separated from one another, it goeswithout saying that it is likewise feasible for the washware to betreated in the different treatment zones for different action times.This is possible particularly when the same treatment program is chosenfor the two treatment zones. In this connection, it is feasible, forexample, for the washware to remain in one of the two treatment zonesfor only one program cycle, while the washware remains in the othertreatment zone for more than one program cycle, it being possible forthe action time to be correspondingly multiplied as a consequence.

According to a preferred realization of the solution according to theinvention, provision is made for the at least two treatment zones to bearranged one above the other. In this connection, it is possible, inparticular, for at least one of the at least two treatment zones, andpreferably each of the at least two treatment zones, to be designed toaccommodate a dish rack, in which the washware which is to be treated inthe treatment zone in question is accommodated, in such a way that thelower region of the dish rack, which lower region supports the dishrack, lies at a predefined or predefinable horizontal wash level.

In a preferred realization of the dishwasher according to the invention,the first treatment zone can be closed by means of a hood which can bepivoted or moved vertically, and the at least one second treatment zonecan be closed by means of a door which is designed separately from thehood. In this case, provision is made, in particular, for the first andat least one second treatment zone to be arranged one above the other.

It has proven advantageous in this case to realize the first treatmentzone as a main treatment zone, and to realize the at least one secondtreatment zone as an auxiliary treatment zone. The dimensions andcleaning capacity of the main treatment zone (first treatment zone) andthe dimensions and cleaning capacity of the auxiliary treatment zone(second treatment zone) are preferably matched to the types of washware(such as crockery, cutlery, glasses and pots for example) which are tobe cleaned and usually accumulate in sculleries, the quantity ofwashware which is to be cleaned and usually accumulates per unit time,depending on the type of washware, and/or to the degree of soiling ofthe washware which accumulates per unit time, in such a way that all ofthe washware which accumulates can be cleaned as far as possible withouta delay even during peak times during operation of the dishwasher.

In this connection, investigations in various sculleries have shown thatit is advantageous when the first treatment zone (main treatment zone)has a loading volume which can be effectively used for cleaning washwareand is 2 to 4 times greater than the loading volume of the at least onesecond treatment zone which can be effectively used. In this case, thefirst treatment zone is particularly suitable for cleaning lightlysoiled washware which, in practice, accumulates substantially morefrequently per unit time in respect of amount in comparison to heavilysoiled washware.

In a preferred realization of the dishwasher, the loading volume of thefirst treatment zone which can be effectively used is between 60 and 180liters, and preferably between 80 and 150 liters, and further preferablyis approximately 120 liters. This has the result that the cleaningcapacity of the first treatment zone, that is to say the quantity ofunits of washware which can be cleaned in the first treatment zone perunit time, corresponds to the cleaning capacity of a conventionalhood-type dishwasher which is known from the prior art and has only asingle treatment zone.

In respect of the loading volume of the at least one second treatmentzone which can be effectively used, it has proven advantageous when thisloading volume is between 25 and 75 liters, and preferably between 30and 50 liters. This ensures that heavily soiled washware can also bepromptly effectively cleaned even at peak times in sculleries.

In order for the dishwasher to fit into a customary work flow in ascullery in an optimum manner, it is preferred when the base area of thefirst treatment zone has dimensions which match the base area of a dishrack, and in particular has a base area of 600 mm×500 mm, 500 mm×500 mmor 400 mm×400 mm. Accordingly, the washware which is loaded into dishracks can be treated in batches in the first treatment zone.

In a preferred refinement of the dishwasher according to the invention,the first treatment zone can be closed by means of a hood which can bepivoted or moved vertically, wherein the hood is realized such that itcan be pivoted or moved vertically upward by at least 300 mm, preferablyby at least 400 mm. This ensures a sufficiently high insertion height,and therefore relatively large items of washware, such as trays forexample, can also be introduced into the first treatment zone andremoved from said first treatment zone without problems. In thisconnection, it is further advantageous when the first treatment zone hasa height, which is effective for cleaning washware, of at least 400 mm.

In respect of the internal dimensions of the at least one secondtreatment zone, it is advantageous when said internal dimensions arematched to the dimensions of pans and/or pots which are usually usedsince this type of washware is generally the most soiled. According toone realization of the dishwasher according to the invention, the atleast one second treatment zone has, to this end, a height, which iseffective for cleaning washware, of at least 120 mm, and preferably ofat least 150 mm.

In order that the dishwasher according to the invention can also be usedwithout problems in relatively small sculleries, the dishwasher has, inthe closed state of the treatment zones, a width of between 500 mm and800 mm, and preferably of between 600 mm and 800 mm, a depth of between700 mm and 900 mm, and preferably of between 750 mm and 850 mm, and aheight of between 1350 mm and 1600 mm, and preferably of between 1400 mmand 1550 mm.

According to a further aspect of the present invention, the dishwasherhas a wash system, which is designed as a recirculation system, forspraying wash liquid in the treatment chamber as required, and has atleast one final rinse system for spraying final rinse liquid in thetreatment chamber as required. Furthermore, a control device is providedfor actuating the at least one wash system and/or the at least one finalrinse system. In this case, the control device is preferably designed toactuate the at least one wash system in such a way that the wash cycleof each treatment cycle in the first treatment zone is interrupted,while the wash cycle of a single treatment cycle in the at least onesecond treatment zone is intermittent. In this way, it is also possibleto adjust the action times of the wash liquid in the individualtreatment zones in each case to any desired values only using a singlewash pump and without the use of a valve controller.

In a development of the last-mentioned embodiment, provision is made inthis connection for the control device to also be designed to actuatethe at least one wash system in such a way that wash liquid is alwayssprayed at the same time in the first and in the at least one secondtreatment zone.

In respect of the at least one final rinse system, provision ispreferably made for the control device to be designed to actuate the atleast one final rinse system in such a way that, in the at least onesecond treatment zone, a final rinse cycle always takes placesimultaneously or at least so as to overlap with a final rinse cycle inthe first treatment zone. Therefore, the risk of the washware beingre-soiled is minimized, this applying in particular to embodiments inwhich the treatment zones are not hermetically separated.

In order for the dishwasher to operate as efficiently as possible inrespect of time, provision is made in a preferred realization of thedishwasher for the treatment cycles in the first and in the at least onesecond treatment zone to be matched to one another with respect to time.To this end, it is feasible for the at least one wash system to beactuated by the control device in such a way that the duration of a washcycle of a single treatment cycle in the at least one second treatmentzone matches the total duration of the wash cycles of a large number oftreatment cycles in the first treatment zone.

The term “treatment cycle” used in the present document is intended tobe understood to mean the cycle to which the washware in question issubjected in the corresponding treatment zone of the dishwasher beforethe washware can be removed from the treatment zone again in the cleanedstate. Therefore, a treatment cycle is usually made up of a wash cycleand a final rinse cycle which takes place following said wash cycle.Wash liquid is sprayed onto the washware during a wash cycle, whilefinal rinse liquid is sprayed onto the washware during a final rinsecycle.

As an alternative or in addition to the last-mentioned embodiment, it isfeasible to actuate the at least one wash system by means of the controldevice in such a way that the duration of a wash cycle of a singletreatment cycle in the at least one second treatment zone is an integermultiple of the duration of one wash cycle in the first treatment zone.

In a preferred development of the dishwasher according to the invention,the control device is also designed to actuate the at least one washsystem and/or the at least one final rinse system in such a way that awash cycle in the at least one second treatment zone is interruptedautomatically, preferably selectively automatically, when at least oneof the following conditions is met:

-   -   a final rinse cycle is taking place in the first treatment zone;        and/or    -   the first treatment zone is open or is not closed; and/or    -   the second treatment zone is open or is not closed.

In this way, the respective final rinse cycle of the individualtreatment zones can be matched in an optimum manner, this savingresources, in particular fresh water and energy.

In order to be able to treat the washware in the treatment zones asefficiently as possible, provision is made in a development of theinvention for the treatment parameters for the treatment zones to beselected in as individual a manner as possible and such that they arematched to the washware which is to be cleaned.

In this connection, it is feasible for the at least one wash system tobe actuated in such a way that, during a wash cycle:

-   -   the temperature of the wash liquid which is sprayed in the first        treatment zone is different from the temperature of the wash        liquid which is sprayed in the at least one second treatment        zone; and/or    -   the nozzle pressure of the wash liquid which is sprayed in the        first treatment zone is different from the nozzle pressure of        the wash liquid which is sprayed in the at least one second        treatment zone; and/or    -   the quantity of wash liquid which is sprayed in the first        treatment zone per unit time is different from the quantity of        wash liquid which is sprayed in the at least one second        treatment zone per unit time; and/or    -   the concentration of detergent in the wash liquid which is        sprayed in the first treatment zone is different from the        concentration of detergent in the wash liquid which is sprayed        in the at least one second treatment zone.

As an alternative or in addition to this, it is feasible for the atleast one final rinse system to be actuated by means of the controldevice in such a way that, during a final rinse cycle:

-   -   the temperature of the final rinse liquid which is sprayed in        the first treatment zone is different from the temperature of        the final rinse liquid which is sprayed in the at least one        second treatment zone; and/or    -   the nozzle pressure of the final rinse liquid which is sprayed        in the first treatment zone is different from the nozzle        pressure of the final rinse liquid which is sprayed in the at        least one second treatment zone; and/or    -   the quantity of final rinse liquid which is sprayed in the first        treatment zone per unit time is different from the quantity of        final rinse liquid which is sprayed in the at least one second        treatment zone per unit time; and/or    -   the concentration of final rinse aid in the final rinse liquid        which is sprayed in the first treatment zone is different from        the concentration of final rinse aid in the final rinse liquid        which is sprayed in the at least one second treatment zone.

The invention is not only directed at an, in particular, hood-typedishwasher in which at least two treatment zones are provided in thetreatment chamber of the dishwasher, but also to a corresponding methodfor operating a dishwasher of this kind.

According to the invention, the method comprises the following methodsteps:

-   -   wash liquid is sprayed at the same time in the first treatment        zone and in the at least one second treatment zone until the        wash cycle in the first treatment zone is complete;    -   after the wash cycle in the first treatment zone is complete,        the wash cycle of the at least one second treatment zone is        interrupted and final rinse liquid is sprayed in the first        treatment zone; and    -   spraying of wash liquid in the at least one second treatment        zone is resumed only when a further wash cycle is started in the        first treatment zone.

In order to carry out the method according to the invention, thedishwasher has—according to a further aspect of the present invention—acontrol device for actuating the at least one wash system of thedishwasher in accordance with a predefined program sequence, wherein atleast one predefined program sequence for the first treatment zoneand/or the at least one second treatment zone is stored in the controldevice. In particular, a large number of predefined program sequencesfor the first treatment zone and/or the at least one second treatmentzone are stored in the control device in order to allow the operator tochoose treatment parameters which are matched as far as possible.

In order to reduce the effort for operator control when choosing aprogram, provision is made in a preferred development of thelast-mentioned embodiments for at least one program sequence groupcontaining a defined program sequence for the first treatment zone and adefined program sequence for the at least one second treatment zone tobe stored in the control device.

In this connection, it is feasible, in particular, for the operator toselectively choose a program sequence from the large number ofpredefined program sequences for the first treatment zone and,independently of this, a program sequence from the large number ofpredefined program sequences for the at least one second treatment zone,or a predefined program sequence group.

The program sequences of the program sequence group are preferablychosen depending on at least one of the factors listed below:

-   -   a quantity of washware which preferably accumulates per unit        time in a standard situation; and/or    -   the different types of washware which preferably accumulate per        unit time in a standard situation; and/or    -   a degree of soiling of the washware which preferably occurs in a        standard situation.

In a preferred realization of the last-mentioned embodiments, provisionis made for the program sequence group to have a program sequence forthe first treatment zone, the duration of a wash cycle of the firsttreatment zone being 40 to 70 seconds (short program), 70 to 120 seconds(standard program) or 2 to 5 minutes (intensive program) in accordancewith said program sequence. In respect of the program sequence for theat least one second treatment zone, provision is made in this case forthe duration of a wash cycle in the at least one second treatment zoneto be identical to the duration of a wash cycle in the first treatmentzone in accordance with said program sequence.

As an alternative or in addition to this, it is feasible for the programsequence group to have a program sequence for the at least one secondtreatment zone, the duration of a wash cycle in the at least one secondtreatment zone being 40 to 70 seconds (short program), 70 to 120 seconds(standard program) or 4 to 10 minutes (intensive program) in accordancewith said program sequence.

According to a further aspect of the present invention, provision ismade for the dishwasher to have at least one user interface with atleast one input area, in particular which can be manually or opticallyoperated, for manually choosing at least one treatment program for thefirst and/or at least one second treatment zone.

An “input area which can be manually operated” is intended to beunderstood to mean, in particular, a keypad or the like, while an “inputarea which can be optically operated” is an input area which can beactuated by means of radio, IR, WLAN or a similar wireless communicationconnection.

According to a preferred realization, provision is made in this case fora common user interface to be provided for the first and at least onesecond treatment zone. This common user interface is preferably arrangedin the upper region of the hood which can be pivoted or moved verticallyand by means of which the first treatment zone can be closed. Thisensures that the operator of the machine can manually operate the inputarea only when the first treatment zone is closed.

As an alternative to this, it goes without saying, however, that it isalso feasible for a user interface to be provided in each case for thefirst and at least one second treatment zone.

In a preferred realization of the invention, provision is made for theat least one user interface to be designed to provide, preferablyoptically and/or acoustically, information relating to a system state ofthe dishwasher.

As an alternative or in addition, it is feasible for the at least oneuser interface to have at least one input area, in particular keypad, inparticular which can be optically or manually operated, for manuallyintervening in a treatment cycle of the first treatment zone and/or in atreatment cycle of the at least one second treatment zone.

In this connection, it is also feasible for the at least one userinterface to have a first input area, in particular keypad, which can bemanually operated, for starting and/or completing a treatment cycle inthe first and/or at least one second treatment zone, and has a secondinput area, in particular which can be manually or optically operatedand is realized separately from the first input area, for retrievinginformation relating to a system state of the dishwasher and/or formanually intervening in a treatment cycle of the first and/or at leastone second treatment zone and/or for calling up and/or choosing programparameters for the first and/or at least one second treatment zone.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described in greater detail below with referenceto the exemplary embodiments which are illustrated in the drawings.

In the drawings:

FIG. 1A shows a perspective view of a batch dishwasher, which isrealized as a hood-type dishwasher, according to one embodiment of thepresent invention;

FIG. 1B shows a front view of the embodiment which is shown in FIG. 1A;

FIG. 2 schematically shows a batch dishwasher, which is realized as ahood-type dishwasher, according to a further embodiment of theinvention;

FIG. 3 schematically shows a batch dishwasher, which is realized as ahood-type dishwasher, according to a further embodiment of theinvention;

FIG. 4 schematically shows a hydraulics diagram of a wash system of adishwasher, which is designed as a batch dishwasher, according to oneembodiment of the present invention;

FIG. 5 schematically shows a hydraulics diagram of a wash system of adishwasher, which is designed as a batch dishwasher, according to afurther embodiment of the present invention;

FIG. 6 schematically shows a hydraulics diagram of a wash system of adishwasher, which is designed as a batch dishwasher, according to afurther embodiment of the present invention; and

FIG. 7 shows an embodiment of a user interface for the dishwasheraccording to the invention.

DETAILED DESCRIPTION

The invention relates to commercial dishwashers, in particulardishwashers or utensil washers, in the form of a batch dishwasher. Inparticular, the present invention relates to batch dishwashers which arerealized as hood-type dishwashers.

A commercial dishwasher 1, which is realized as a batch dishwasher,usually has a program control device (also designated “control device100” in the present document) for controlling at least one cleaningprogram, and has a treatment chamber 2, which can be closed by at leastone door 9 and/or at least one hood 8, in a machine housing foraccommodating washware, such as crockery, cutlery, pots, pans, trays andglasses for example, which is to be cleaned.

As can be seen in the illustrations in FIGS. 2 and 3 in particular, itis advantageous from an ergonomical perspective for a batch dishwasher,which is realized as a hood-type dishwasher 1, to be equipped with arespective table (entry table 3, exit table 4) at its entry end and exitend. The racks 5 which are loaded with dirty washware can therefore bepushed into the dishwasher 1 at the entry table 3. After the washware istreated in the treatment chamber 2 of the dishwasher 1, the rack 5containing the now cleaned washware is moved out of the machine 1 ontothe exit table 4.

The action time, that is to say the time during which cleaning liquid orwash liquid wets the washware within the treatment chamber 2, depends,in particular, on the duration of the wash phase, which duration isdefined by means of the treatment program. For normally soiled washware,such as plates, trays, cups and glasses, a cleaning cycle comprising awash phase and a subsequent final rinse phase generally requires between50 and 100 seconds. However, longer treatment of the washware may benecessary, in particular when said washware exhibits a high level ofsoiling, or when dirt is burnt onto the washware. Extension of the totaltreatment time to up to 400 seconds is often required in this case.Owing to the extended action time, the washware which is to be cleanedis subjected to intensive treatment, so that heavily soiled washware canalso be effectively cleaned.

In order to ensure that the cleaning capacity of the dishwasher 1, thatis to say the units of washware/washware racks 5 which can theoreticallybe processed by the machine 1 per unit time, is not negativelyinfluenced in spite of an intensive treatment, provision is madeaccording to the invention for the treatment chamber 2 of the dishwasher1, which is designed as a batch dishwasher, to be divided into at leasttwo treatment zones 6, 7, wherein the at least two treatment zones 6, 7are realized such that the washware can be treated in the individualtreatment zones 6, 7 independently of one another.

Even though the exemplary embodiments of the dishwasher 1 according tothe invention which are illustrated in the drawings are each realizedwith exactly two treatment zones 6, 7, this should not be regarded asbeing restrictive. Rather, it goes without saying that it is alsofeasible for the treatment chamber 2 of the dishwasher 1 according tothe invention to be divided into more than two zones.

As illustrated in FIGS. 1A and 1B for example, one exemplary embodimentof the present invention relates to a hood-type dishwasher 1 which isdistinguished, in particular, in that, in addition to the usuallyprovided (main) treatment zone 6, a further treatment zone 7 which isarranged beneath said treatment zone 6 is provided. The upper maintreatment zone 6, which is also designated “first treatment zone” in thepresent document, is designed to accommodate a dish rack 5 which may beloaded with the washware which is to be treated.

To this end, the base area of the first treatment zone or main treatmentzone 6 has dimensions which match the base area of a dish rack 5, and inparticular has a base area of 600 mm×500 mm, 500 mm×500 mm or 400 mm×400mm.

Furthermore, the main treatment zone 6 is designed such that the dishrack 5 can be pushed directly into the treatment zones 6 of thehood-type dishwasher 1 from an entry table 3 (not illustrated in FIGS.1A and 1B). In other words, the wash level 6 a of the main treatmentzone 6 is aligned with the table height of the entry table 3 in thehorizontal direction.

In the dishwasher 1 which is shown in FIG. 1B, the height of thehorizontal wash level 6 a of the first treatment zone 6 can, inparticular, be variably adjusted and is preferably 800 mm to 900 mm, andpreferably 830 mm to 890 mm. The height of the horizontal wash level 6 aof the first treatment zone 6 is adjusted, for example, by means ofvertically adjustable feet of the machine.

An exit table 4 is also preferably provided, wherein the table height ofthe exit table 4 is likewise horizontally aligned with the wash level 6a of the main treatment zone 6, so that the dish rack 5 can be pusheddirectly onto the exit table 4 after treatment in the main treatmentzone 6.

As already indicated, a further treatment zone 7 is realized beneath themain treatment zone 6. This further treatment zone 7, which is alsodesignated “second treatment zone” or “auxiliary treatment zone” in thepresent document, serves, in particular, for cleaning washware whichrequires a longer action time in comparison to the washware which is tobe cleaned in the first treatment zone 6.

In the exemplary embodiment which is illustrated in FIGS. 1A and 1B, thesecond treatment zone 7 is likewise designed to accommodate a dish rack5, wherein the washware which is to be treated in the further treatmentzone 7 is accommodated in the dish rack 5.

Specifically, the dimensions and cleaning capacity of the main treatmentzone (first treatment zone 6) and the dimensions and cleaning capacityof the auxiliary treatment zone (second treatment zone 7) are preferablymatched to the types of washware (such as crockery, cutlery, glasses andpots for example) which are to be cleaned and usually accumulate insculleries, the quantity of washware which is to be cleaned and usuallyaccumulates per unit time, depending on the type of washware, and/or tothe degree of soiling of the washware which accumulates per unit time,in such a way that all of the washware which accumulates can be cleanedas far as possible without a delay even during peak times duringoperation of the dishwasher 1.

Therefore, in the embodiment of the dishwasher 1 according to theinvention which is shown in FIG. 1B, provision is made for the firsttreatment zone 6 to have a loading volume which can be effectively usedfor cleaning washware and is 2 to 4 times greater than the loadingvolume of the second treatment zone 7 which can be effectively used.Specifically, the loading volume of the first treatment zone 6 which canbe effectively used is between 60 and 180 liters, and preferably between80 and 150 liters, and further preferably is approximately 120 liters,while the loading volume of the second treatment zone 7 which can beeffectively used is between 25 and 75 liters, and preferably between 30and 50 liters. This ensures that heavily soiled washware can also bepromptly effectively cleaned even at peak times in sculleries.

As illustrated, in the exemplary embodiment of the invention which isschematically illustrated in FIGS. 1A and 1B, provision is made forwashware to be loaded into and unloaded from the two treatment zones 6,7 independently of one another. Specifically, washware can be loadedinto or unloaded from the first treatment zone 6 via an opening whichcan be closed by a hood 8 which can move in the vertical direction. Themovement travel of the hood 8 is at least 300 mm, preferably at least400 mm, while the first treatment zone 6 has a height, which iseffective for cleaning washware, of at least 400 mm.

Secondly, the second treatment zone 7 has a height, which is effectivefor cleaning washware, of at least 120 mm, and preferably of at least150 mm, and therefore cutlery which is accommodated in cutlery racks canalso be cleaned in this treatment zone 7.

In addition to this, the second treatment zone 7 has a dedicated openingwhich can be closed and via which washware can be loaded into orunloaded from said treatment zone 7.

In the exemplary embodiment which is illustrated in FIGS. 1A and 1B,provision is made, in particular, for the second treatment zone 7 tohave a dedicated opening which can be closed by means of a door 9 thatcan be pivoted about a horizontal pivot axis and via which openingwashware can be loaded into and unloaded from the second treatment zone7.

In this case, it is advantageous, in particular, for the door 9 whichcan be pivoted about a horizontal pivot axis to be designed in such away that said door, when it is in its open state, is horizontallyaligned with the wash level 7 a of the further treatment zone 7. In thisway, the door 9, in its open state, serves simultaneously as a loadingand unloading aid for inserting and, respectively, removing the washwareinto/from the dish rack 5.

Like the height of the horizontal wash level 6 a of the first treatmentzone 6, the height of the horizontal wash level 7 a of the secondtreatment zone 7 can be variably adjusted, and is preferably 350 mm to600 mm, and further preferably 500 mm to 600 mm (measured from the floorof the room in which it is installed).

FIG. 2 shows the exemplary embodiment of the dishwasher 1 according tothe invention in line with FIGS. 1A and 1B in a configuration in whichthe dishwasher 1 is equipped with entry and exit tables 3, 4.Specifically, the dirty washware is usually manually pre-cleared andmanually pre-washed at the entry end of the dishwasher 1. Furthermore,the dirty washware can be loaded into special dish racks 5 here.

The exit end is used for drying purposes and unloading the dish racks.As illustrated in FIG. 2, the wash level 6 a of the main treatment zone6 is at the same height as the entry and exit tables 3, 4. In this way,the dish racks 5 which are to be cleaned can be easily and ergonomicallypushed into the main treatment zone 6 of the hood-type dishwasher 1 fromthe entry table 3 and, after cleaning is complete, pushed out of thedishwasher 1 onto the exit table 4.

As can be seen, in particular, in the schematic illustration in FIG. 3,the present invention is not restricted to the additional treatment zone7 being arranged beneath the main treatment zone 6. Rather, it goeswithout saying that it is also feasible for the additional treatmentzone 7 to be arranged next to the main treatment zone 6 or above themain treatment zone 6.

In respect of the embodiments of the dishwasher 1 according to theinvention which are shown in FIGS. 1 to 3, it should be noted that saiddishwasher has, in the closed state of the treatment zones 6, 7, a widthof between 500 mm and 800 mm, and preferably of between 600 mm and 800mm, a depth of between 700 mm and 900 mm, and preferably of between 750mm and 850 mm, and a height of between 1350 mm and 1600 mm, andpreferably of between 1400 mm and 1550 mm. In other words, the externaldimensions of the dishwasher 1 according to the invention are comparablewith those of a conventional machine of the same type which, however,has only a single treatment zone, wherein the machine capacity isincreased, along with a relatively reduced consumption of resources,using the dishwasher according to the invention.

In order to clean, for example, the washware which accumulates in thecase of a total of 150 meals, a conventional dishwasher, which howeverhas only a single treatment zone, requires a total of 67 minutes and afresh water consumption of 100 liters and an energy consumption of 2.9kWh (with a standard treatment program).

Using the dishwasher 1 according to the invention however, the treatmentduration can be reduced to less than 50 minutes, specifically with afresh water consumption of 72.5 liters and an energy consumption of 2.1kWh.

The manner of operation of different wash/final rinse systems which canbe used, for example, in a dishwasher 1 according to the presentinvention which is designed as a batch dishwasher is described belowwith reference to the illustrations in FIGS. 4 to 6.

Although it is feasible, in principle, to equip the dishwasher 1according to the present invention with several wash tanks, wherein eachwash tank is associated with a treatment zone 6, 7, provision is made inthe preferred exemplary embodiments of the solution according to theinvention which are illustrated in the drawings for the dishwasher 1 toin each case have only a single wash tank 12 which is associated withthe (single) treatment chamber 2 and therefore with the individualtreatment zones 6, 7 of the (single) treatment chamber 2 jointly.

The wash tank 12 preferably has a capacity of 20 to 40 liters,preferably 25 to 35 liters. This capacity is firstly sufficient for thesimultaneous final rinse operation in the two treatment zones 6, 7.Secondly, the tank 12 is selected to be so small that, as before, it canbe accommodated in the reduced—in comparison to a conventional machinewhich however has only a single treatment zone—installation space in themachine housing.

As illustrated in the hydraulics diagrams according to FIGS. 4 to 6, the(single) wash tank 12 is located beneath the treatment chamber 2 of themachine 1 and serves to receive liquid which is sprayed in therespective treatment zones 6, 7 of the treatment chamber 2. As alreadyindicated, provision is made in the embodiments illustrated in thedrawings for the treatment chamber 2 of the dishwasher 1 to be dividedinto a total of two treatment zones 6, 7, specifically into a maintreatment zone 6 and an additional treatment zone 7. A common washsystem is associated with the treatment zones 6, 7 which are integratedwithin the (single) treatment chamber 2.

In the hydraulics diagram which is illustrated in FIG. 4, the washsystem has a (common) wash pump 13 with which wash liquid can beconveyed from the wash tank 12, through a wash liquid line system, tocorresponding wash nozzles 11.1, 11.2.

In the embodiment which is schematically illustrated in FIG. 4, the washnozzles 11.1, 11.2 are integrated into corresponding wash arms 10.1,10.2, 10.3, 10.4. In this case, provision is made for a first nozzlearrangement comprising an upper wash arm 10.1 and a lower wash arm 10.2to be associated with the upper (main) treatment zone 6. A furthernozzle arrangement, which likewise has an upper wash arm 10.3 and alower wash arm 10.4, is associated with the lower (additional) treatmentzone 7.

In the hydraulics diagram which is shown in FIG. 4, the lower wash arm10.2 of the main treatment zone 6 and the upper wash arm 10.3 of theadditional treatment zone 7 are realized as a common wash arm. In otherwords, a single wash arm 10.2, 10.3 which has a double function is usedin this exemplary embodiment: said common wash arm serves as a lowerwash arm of the (upper) main treatment zone 6 and, at the same time, asan upper wash arm of the (lower) additional treatment zone 7. To thisend, the common wash arm has wash nozzles 11.1 which are oriented in thedirection of the (upper) main treatment zone 6, and wash nozzles 11.2which are oriented in the direction of the (lower) additional treatmentzone 7.

It goes without saying that the present invention is not restricted tothis aspect. As can be seen in the hydraulics diagram according to FIG.5, it is also feasible for a common wash arm to not be used, andtherefore for separate wash arms 10.1-10.4 to be associated with eachindividual treatment zone 6, 7.

The wash nozzles 11.1, 11.2 which are integrated into the correspondingwash arms 10.1-10.4 are each directed toward the correspondinglyassociated treatment zone 6, 7 in the treatment chamber 2 and serve forspraying wash liquid, which is conveyed by the common wash pump 13, ontothe washware which is to be cleaned and is arranged in the treatmentzones 6, 7 in question.

The sprayed wash liquid falls back into the wash tank 12 due to theforce of gravity. As a result, the wash tank 12, the wash pump 13, thewash liquid system 16 and the wash nozzles 11 form a wash liquid circuittogether with the treatment zones 6, 7 of the treatment chamber 2. Thewash liquid line system 16 connects the delivery end of the wash pump 13to the wash nozzles 11.1, 11.2.

Also provided is a final rinse system for conveying final rinse liquidthrough a final rinse line system 17 to final rinse nozzles 15.1, 15.2,which are directed toward the region of the washware which is to becleaned in the treatment chamber 2, by means of a final rinse pump 14.The sprayed final rinse liquid falls into the wash tank 12 from thetreatment chamber 2 due to the force of gravity. The final rinse liquidsystem 17 connects the delivery end of the final rinse pump 14 to thefinal rinse nozzles 15.1, 15.2.

As already stated, the wash nozzles 11.1, 11.2 and the final rinsenozzles 15.1, 15.2 can be arranged in the regions above and/or belowand, if desired, also to the sides of the treatment zones 6, 7 inquestion within the treatment chamber 2 and each be directed toward theregion in which the washware is positioned in the correspondingtreatment zone.

Each treatment zone 6, 7 is preferably provided with a large number ofwash nozzles 11.1 and 11.2 on at least one upper wash arm 10.1 and 10.3,a large number of wash nozzles 11.1 and 11.2 on a lower wash arm 10.2and 10.4, a large number of final rinse nozzles 15.1 and 15.2 on atleast one upper final rinse arm 18.1 and 18.3, and a large number offinal rinse nozzles 15.1 and 15.2 on at least one lower final rinse arm18.2 and 18.4. As already stated, the lower wash arm 10.2 of the uppermain treatment zone 6 and the upper wash arm 10.3 of the loweradditional treatment zone 7 can be designed as a common wash arm in thiscase (cf. FIG. 4). This also applies for the corresponding final rinsearms 18.2, 18.3.

However, as an alternative to this, it is equally feasible for each ofthe at least two treatment zones 6, 7 to be provided with separate washand final rinse arms 10.1-10.4 and 18.1-18.4, as is indicated in thehydraulics diagram according to FIG. 5.

Before final rinse liquid is sprayed during the final rinse phase, aquantity of wash liquid which corresponds to the final rinse liquid isin each case pumped out of the wash tank 12 by means of a discharge pump(not illustrated in the drawings), the intake end of said discharge pumpbeing connected to a sump of the wash tank 12 via a discharge line. Ifthe wash tank 12 is empty before the dishwasher 1, which is designed asa batch dishwasher, is first started, said wash tank first has to befilled with fresh water via a fresh water line (not shown) or with freshwater or another final rinse liquid or wash liquid by means of the finalrinse system and the final rinse pump 14 of said final rinse system.

The final rinse liquid may be fresh water or fresh water which is mixedwith rinse aid. The wash liquid on the other hand contains detergentwhich is preferably automatically added in a metered manner to theliquid which is contained in the wash tank 12 by a detergent meteringapparatus (not shown). The abovementioned program control devicecontrols the wash pumps 13, the final rinse pump 14, the discharge pumpand the detergent solution pump (not shown) depending on the cleaningprogram in each case selected on the program control device by anoperator. At least one cleaning program is provided; a plurality ofcleaning programs which can be selectively chosen are preferablyprovided.

It can be seen from the hydraulics diagrams illustrated in the drawingsthat a final rinse pump 14, by way of its intake end, is also connectedto an outlet of a boiler 22. The boiler 22 further has an inlet which isconnected to a fresh water supply line 30 via which fresh water or freshwater to which rinse aid has been added in a metered manner is suppliedto the boiler 22. In the boiler 22, the liquid (pure fresh water orfresh water to which rinse aid has been added in a metered manner) whichis supplied via the inlet is heated up as prescribed by a processsequence. The final rinse liquid which is heated up in the boiler 22 canbe supplied to the final rinse nozzles 15.1 and 15.2 by means of thefinal rinse line system 17 for example during a fresh water final rinsephase by means of the final rinse pump 14 which, by way of its intakeend, is connected to the boiler outlet. The final rinse nozzles 15.1 and15.2 are arranged in the treatment zones 6, 7 of the treatment chamber 2in order to spray the final rinse liquid, which is heated up in theboiler 22, onto the washware in the corresponding treatment zone 6, 7 ofthe treatment chamber 2. It goes without saying that it is also feasiblefor pure fresh water to be supplied to the boiler 22 via the inlet inthe fresh water supply line 30, a rinse aid being added in a meteredmanner to said pure fresh water after it is heated in the boiler 22.

In this connection, it is also feasible for the final rinse system tohave a preferably electrically operated steam generator which can beintegrated into the boiler 22 for example. In this case, a correspondingsteam outlet of the steam generator can be formed at the upper region ofthe boiler 22 (not illustrated in the drawings). The steam outlet of thesteam generator can be connected to the treatment chamber via a steamline at a point which is situated above the wash tank, in order tointroduce the steam which is generated in the steam generator into saidtreatment chamber as required. It goes without saying, however, thatother positions are also possible.

A heater 47 is located in the boiler 22 which, according to someembodiments of the invention, serves not only to heat the final rinseliquid but also to generate steam if required. A level sensor whichcontrols, for example, a valve 49 of the fresh water line 30 can also bearranged in or on the boiler 22.

It can also be seen with reference to the hydraulics diagram illustratedin FIG. 6 that a dedicated wash system and a dedicated final rinsesystem can also be associated with each individual treatment zone 6, 7.In contrast to the embodiments which are shown in FIGS. 4 and 5, adedicated wash pump 13.1 and a dedicated wash liquid system 16.1 andalso a dedicated final rinse pump 14.1 with a dedicated final rinse linesystem 17.1 are associated with the treatment zone 6 in this case. Inthe same way, a dedicated wash pump 13.2 and a dedicated wash liquidsystem 16.2 and also a dedicated final rinse pump 14.2 with a dedicatedfinal rinse line system 17.2 are associated with the treatment zone 7.In this case, the wash pumps 13.1, 13.2 and the final rinse pumps 14.1,14.2 can be actuated independently of one another by a control device,not shown, so that different treatment programs can be realized in therespective treatment zones independently of one another.

Specifically, the control device 100 which is schematically indicated inFIGS. 4 to 6 serves to actuate the corresponding components, which canbe actuated, of the wash and/or final rinse system of the dishwasher 1.In particular, the control device 100 is designed to actuate thepreferably common wash pump 13 of the wash system in such a way that thewash cycle of each treatment cycle in the first treatment zone 6 isinterrupted, while the wash cycle of a single treatment cycle in thesecond treatment zone 7 is intermittent.

Furthermore, in the exemplary embodiments of the dishwasher 1 accordingto the invention which are illustrated in the drawings, the controldevice 100 is also designed to actuate the preferably common wash pump13 in such a way that wash liquid is always sprayed at the same time inthe first and in the second treatment zone 6, 7.

In respect of the final rinse system of the dishwasher 1, the controldevice 100 is designed to actuate the two final rinse pumps 14.1, 14.2in such a way that, in the second treatment zone 7, a final rinse cyclealways takes place simultaneously or at least so as to overlap with afinal rinse cycle in the first treatment zone 6.

In this case, it is advantageous when the control device 100 is alsodesigned to actuate the preferably common wash pump 13 in such a waythat the duration of a wash cycle of a single treatment cycle in thesecond treatment zone 7 matches the total duration of the wash cycles ofa large number of treatment cycles in the first treatment zone 6. Inparticular, it is feasible in this connection for the control device 100to actuate the preferably common wash pump 13 in such a way that theduration of a wash cycle of a single treatment cycle in the secondtreatment zone 7 is an integer multiple of the duration of one washcycle in the first treatment zone 6.

In principle, provision is made in the embodiments of the dishwasher 1according to the invention which are illustrated in the drawings for thecontrol device 100 to be designed to actuate the at least one washsystem and/or the at least one final rinse system in such a way that awash cycle in the second treatment zone 7 is interrupted automatically,preferably selectively automatically, when at least one of the followingconditions is met:

-   -   a final rinse cycle is taking place in the first treatment zone        6; and/or    -   the first treatment zone 6 is open or is not closed, it being        possible for this to be detected by means of a corresponding        sensor for example; and/or    -   the second treatment zone 7 is open or is not closed, it being        possible for this to likewise be detected by means of a        corresponding sensor for example.

The wash system and/or final rinse system are preferably automaticallyactuated. In other words, the at least one wash and/or final rinsesystem is preferably actuated in accordance with a predefined programsequence, wherein at least one predefined program sequence for the firsttreatment zone 6 and/or the at least one second treatment zone 7 isstored in the control device 100. A large number of predefined programsequences for the first treatment zone 6 and/or the at least one secondtreatment zone 7 are preferably stored in the control device 100.

In this connection, it is feasible for at least one program sequencegroup containing a defined program sequence for the first treatment zone6 and a defined program sequence for the at least one second treatmentzone 7 to be stored in the control device 100. In this case, a programsequence from the large number of predefined program sequences for thefirst treatment zone 6 and, independently of this, a program sequencefrom the large number of predefined program sequences for the at leastone second treatment zone 7, or a predefined program sequence group, canbe selectively chosen by the operator of the dishwasher 1.

At least one program sequence group containing a defined programsequence for the first treatment zone 6 and containing a defined programsequence for the at least one second treatment zone 7 is advantageouslystored in the control device 100, and wherein the program sequences ofthe program sequence group are chosen depending on at least one of thefactors listed below:

-   -   a quantity of washware which preferably accumulates per unit        time in a standard situation; and/or    -   the different types of washware which preferably accumulate per        unit time in a standard situation; and/or    -   a degree of soiling of the washware which preferably occurs in a        standard situation.

It is also preferred for at least one program sequence group containinga defined program sequence for the first treatment zone 6 and a definedprogram sequence for the at least one second treatment zone 7 to bestored in the control device 100, wherein the program sequence group hasa program sequence for the first treatment zone 6, the duration of awash cycle of the first treatment zone being 40 to 70 seconds, 70 to 120seconds or 2 to 5 minutes in accordance with said program sequence, andwherein the program sequence group has a program sequence for the atleast one second treatment zone 7, the duration of a wash cycle in thesecond treatment zone 7 being identical to the duration of a wash cyclein the first treatment zone 6 in accordance with said program sequence.

Secondly, it is preferred for at least one program sequence groupcontaining a defined program sequence for the first treatment zone 6 anda defined program sequence for the at least one second treatment zone 7to be stored in the control device 100, wherein the program sequencegroup has a program sequence for the first treatment zone 6, theduration of a wash cycle in the first treatment zone being 40 to 70seconds, 70 to 120 seconds or 2 to 5 minutes in accordance with saidprogram sequence, and wherein the program sequence group has a programsequence for the at least one second treatment zone 7, the duration of awash cycle in the second treatment zone being 40 to 70 seconds, 70 to120 seconds or 4 to 10 minutes in accordance with said program sequence.

An exemplary embodiment of a user interface 110 is described below withreference to the illustration in FIG. 7, it being possible for anoperator of the dishwasher 1 according to the invention to choose atleast one treatment program or corresponding treatment parameters forthe first and/or second treatment zone 6, 7 via said user interface.

Specifically, the embodiment of the user interface 110 which isillustrated in FIG. 7 is realized as a common user interface for bothtreatment zones 6, 7 of the dishwasher 1. As can be seen from theillustrations in FIGS. 1 to 4, this common user interface 110 isarranged in the upper region of the movable hood 8.

It goes without saying that the present invention is not restricted toembodiments in which a common user interface 110 is used for all of thetreatment zones 6, 7 of the dishwasher 1. In particular, it is feasiblefor a user interface to be provided in each case for the first and atleast one second treatment zones 6, 7. In this case, it would bepossible to arrange the user interface 110 for the first treatment zone6 in the upper region of the hood 8, and to arrange the user interface110 for the at least one second treatment zone 7 above the door 9 whichis realized separately from the hood 8.

As indicated in FIG. 7, the user interface 110 is designed to provideinformation relating to a system state of the dishwasher 1. In theillustration in FIG. 7, this is performed in an optical manner by meansof a corresponding information area 113.

Furthermore, the user interface 110 is provided with an input area 111in order to allow the operator to manually intervene in a treatmentcycle of the first treatment zone 6 and/or in a treatment cycle of theat least one second treatment zone 7.

In particular, the user interface 110 which is schematically illustratedin FIG. 7 is provided with a first input area 114, which can be manuallyoperated, in order to start and, respectively, complete a treatmentcycle in the first and/or at least one second treatment zone 7, and witha second input area 111, which is realized separately from the firstinput area 114, in order to retrieve information relating to a systemstate of the dishwasher 1 and/or in order to intervene in a treatmentcycle of the first and/or at least one second treatment zone 7, and/orin order to call up and/or choose program parameters for the firstand/or at least one second treatment zone 7.

Accordingly, in summary, it is clear that the solution according to theinvention provides at least one additional treatment zone 7,specifically in particular for washware, such as cutlery or GNcontainers, which is generally heavily soiled and therefore requires alonger dishwashing duration. In this way, the wash performance can beimproved by extending the program duration of the additional treatmentzone 7, specifically in such a way, as is necessary for the type ofwashware which is to be treated in this treatment zone 7, that asatisfactory dishwashing result is ensured. In addition to this, thecapacity of the main wash zone 6 is not negatively influenced, that isto say not reduced, despite the use of the intensive program in theadditional treatment zone 7.

By way of example, five racks can be treated by the main treatment zone6 using a standard treatment program, while one rack can additionally betreated at the same time, that is to say in parallel, in the lower oradditional treatment zone 7 using an intensive treatment program.

Therefore, the previously existing treatment zone 6 can be operatedwithout a loss of capacity for the washware with a normal level ofsoiling in comparison to current machines, specifically withsimultaneous improvement in the wash result for heavily soiled washware,since said heavily soiled washware can be cleaned in parallel in theadditional treatment zone 7, for example using a special intensivetreatment program.

The invention is not restricted to the exemplary embodiments which areillustrated purely by way of example in the drawings, but rather can begathered by looking at all of the features and aspects disclosed in saidexemplary embodiments together.

1-52. (canceled)
 53. A hood-type batch dishwasher, wherein thedishwasher (1) has a treatment chamber (2) with at least one wash systemwhich includes a recirculation system, wherein the treatment chamber (2)has a first treatment zone (6) and at least one further, secondtreatment zone (7), wherein items of washware can be treatedindependently of one another and at least temporarily at the same timein the first and in the at least one second treatment zone (6, 7),wherein the first and at least one second treatment zone (6, 7) arearranged one above the other, and wherein the dishwasher (1) has, in aclosed state of the treatment zones (6, 7), a width of between 500 mmand 800 mm, a depth of between 700 mm and 900 mm, and a height ofbetween 1350 mm and 1600 mm.
 54. The dishwasher of claim 53 wherein thedishwasher has, in the closed state of the treatment zones, a width ofbetween 600 mm and 800 mm, a depth of between 750 mm and 850 mm, and aheight between 1400 mm and 1550 mm
 55. The dishwasher (1) as claimed inclaim 53, wherein the first treatment zone (6) can be closed by means ofa hood (8) which can be pivoted or moved vertically, and the at leastone second treatment zone (7) can be closed by means of a door (9) whichis realized separately from the hood (8).
 56. The dishwasher (1) asclaimed in claim 55, wherein the hood (8) is realized such that it canbe pivoted or moved vertically upward by at least 300 mm.
 57. Thedishwasher as claimed in claim 55, wherein the hood (8) is realized suchthat it can be pivoted or moved vertically upward by at least 400 mm.58. The dishwasher (1) as claimed in claim 56, wherein the door (9) isconfigured to pivot about a horizontal pivot axis and is realized insuch a way that the door (9), when the door (9) is in an open state, thedoor (9) is horizontally aligned with a horizontal wash level (7 a) ofthe at least one second treatment zone (7).
 59. The dishwasher (1) asclaimed in claim 58, wherein a height of the horizontal wash level (7 a)of the at least one second treatment zone (7) can be variably adjusted,and is between 350 mm to 600 mm.
 60. The dishwasher (1) as claimed claim53, wherein a base area of the first treatment zone (6) has dimensionsthat substantially match one of 600 mm×500 mm, 500 mm×500 mm or 400mm×400 mm.
 61. The dishwasher (1) as claimed in claim 53, wherein thefirst treatment zone (6) has a height, which is effective for cleaningwashware, of at least 400 mm.
 62. The dishwasher (1) as claimed in claim61, wherein the at least one second treatment zone (7) has a height,which is effective for cleaning washware, of at least 150 mm.
 63. Thedishwasher (1) as claimed in claim 53, wherein the first treatment zone(6) is designed to accommodate a dish rack (5) in such a way that alower region of the dish rack (5), which lower region supports the dishrack (5), lies at a predefined or predefinable horizontal wash level (6a).
 64. The dishwasher (1) as claimed in claim 63, wherein the height ofthe horizontal wash level (6 a) of the first treatment zone (6) can bevariably adjusted in a range between 800 mm to 900 mm.
 65. Thedishwasher (1) as claimed in claim 64, wherein the dishwasher (1) isequipped with an entry and/or exit table (3, 4) at its entry and/or exitend, and wherein a table level of the entry and/or exit table (3, 4) isaligned with the horizontal wash level (6 a) of the first treatment zone(6).
 66. The dishwasher (1) as claimed in claim 53, wherein the at leasttwo treatment zones (6, 7) are not hermetically separated from oneanother.
 67. The dishwasher (1) as claimed in claim, wherein the washsystem is configured for spraying wash liquid in the treatment chamber(2), and the dishwasher includes a final rinse system for spraying finalrinse liquid in the treatment chamber (2), and wherein the dishwasher(1) also has a control device (100) for actuating the at least one washsystem and/or the at least one final rinse system, wherein the controldevice (100) is designed to actuate the at least one wash system in sucha way that the wash cycle of each treatment cycle in the first treatmentzone (6) is uninterrupted, while the wash cycle of a single treatmentcycle in the at least one second treatment zone (7) is intermittent. 68.The dishwasher (1) as claimed in claim 67, wherein the control device(100) is also designed to actuate the at least one wash system in such away that wash liquid is always sprayed at the same time in the first andin the at least one second treatment zone (6, 7); and/or wherein thecontrol device (100) is designed to actuate the at least one final rinsesystem in such a way that, in the at least one second treatment zone(7), a final rinse cycle always takes place simultaneously or at leastso as to overlap with a final rinse cycle in the first treatment zone(6).
 69. A method for operating a commercial hood-type dishwasher havinga treatment chamber (2) which is divided into a first treatment zone (6)and at least one further second treatment zone (7), wherein the methodcomprises the following method steps: wash liquid is sprayed at the sametime in the first treatment zone (6) and in the at least one secondtreatment zone (7) until the wash cycle in the first treatment zone (6)is complete; after the wash cycle in the first treatment zone (6) iscomplete, the wash cycle of the at least one second treatment zone (7)is interrupted and final rinse liquid is sprayed in the first treatmentzone (6); and spraying of wash liquid in the at least one secondtreatment zone (7) is resumed only when a further wash cycle is startedin the first treatment zone (6).